Basically make some mini games that are relevant to skills you need (or at least very good to have) to play the game. This could either be in the training hall or BN.

Examples:

Shield Bouncing - Some kinda of herding game where you have to get all the mobs into an area as fast as possible.

Dodging - Spawn the player(s) in a room with gun puppies and see how long they can last without a shield, just dodging. This could be done with rounds which last for 30 seconds and there are increasing amounts of gun puppies each round.

Killing - Basically an arena but you have to go as fast as possible? Maybe you can think of something better :/

Shooting - Target practice?

All of these could have very good, competitive leaderboards and would help people to improve/show their skills.

What do ya think?

Thanks